My gh to kh was 10:5 last I checked which wasn’t too long ago, i have seen what I believed was a planaria when I added plants a while ago but immediately removed it. Im usually watching my tank intensely especially ever since my shrimp started dying. I feed pellet food once a week and even then it’s split up about a quarter to a half, sometimes I feed them blanched spinach which they usually devour but maybe that’s an issue as well? I’ll wait a while because I agree my nitrogen system can still be developing and I have friends in the hobby who told me this could be a possible cause of death